P
US4440666AExpiredUtilityPatentIndex 70

Method of making corrosion inhibiting polyamine amides, the amides, and use therefor

Assignee: ATLANTIC RICHFIELD COPriority: Aug 6, 1982Filed: Aug 6, 1982Granted: Apr 3, 1984
Est. expiryAug 6, 2002(expired)· nominal 20-yr term from priority
Inventors:MILLER RICHARD FGO TONY SWILSON III GEORGE R
C10M 2215/28C10M 2217/046C10M 2215/04C10M 133/16C10N 2030/12C10M 2215/08C10M 2217/06C10M 2215/082C10M 2215/26
70
PatentIndex Score
16
Cited by
4
References
28
Claims

Abstract

A hydrocarbonaceous liquid stream is modified to contain a minor amount of the amide reaction product of a polyalkylene polyamine, a neo-acid having 5 to 20 carbon atoms, the neo-acid having three alkyl groups on the carbon atom which is in the alpha position relative to the carboxylic group, and an aliphatic fatty acid having 10 to 30 carbon atoms, whereby corrosion of iron and other metals contacted by said stream is significantly reduced. The amides of the invention have the structural formula: <IMAGE>

Claims

exact text as granted — not AI-modified
The invention claimed is: 
     
       1. A corrosion inhibitor for hydrocarbonaceous liquid processing systems comprised of an amide having the structural formula: ##STR5## wherein R is a straight or branched chain alkylene group having 2 to 6 carbon atoms; x is an integer of 0 to 12; R', R" and R'" are the same or different alkyl groups and the average sum of the carbon atoms in R', R" and R'" varies from 3 to 20, and R"" is an aliphatic hydrocarbon radical having 9 to 29 carbon atoms. 
     
     
       2. The corrosion inhibitor of claim 1 wherein R is ethylene, propylene or butylene and x is 0, 1 or 2. 
     
     
       3. The corrosion inhibitor of claims 1 or 2 wherein the average sum of the carbon atoms in R', R" and R'" is 3 to 18. 
     
     
       4. The corrosion inhibitor of claims 1 or 2 wherein R', R" and R'" are methyl radicals. 
     
     
       5. The corrosion inhibitor of claims 1 or 2 wherein the sum of the carbon atoms in R', R" and R'" is 8. 
     
     
       6. The corrosion inhibitor of claims 1 or 2 wherein the sum of the carbon atom in R', R" and R'" is 18. 
     
     
       7. The corrosion inhibitor of claim 3 wherein R"" has 11 to 19 carbon atoms. 
     
     
       8. The corrosion inhibitor of claim 4 wherein R"" has 11 to 19 carbon atoms. 
     
     
       9. The corrosion inhibitor of claim 5 wherein R"" has 11 to 19 carbon atoms. 
     
     
       10. The corrosion inhibitor of claim 6 wherein R"" has 11 to 19 carbon atoms. 
     
     
       11. The corrosion inhibitor of claim 7 wherein R"" is an ethylenically unsaturated aliphatic radical having 13 to 17 carbon atoms. 
     
     
       12. The corrosion inhibitor of claim 8 wherein R"" is an ethylenically unsaturated aliphatic radical having 13 to 17 carbon atoms. 
     
     
       13. The corrosion inhibitor of claim 9 wherein R"" is an ethylenically unsaturated aliphatic radical having 13 to 17 carbon atoms. 
     
     
       14. The corrosion inhibitor of claim 10 wherein R"" is an ethylenically unsaturated aliphatic radical having 13 to 17 carbon atoms. 
     
     
       15. The corrosion inhibitor of claim 3 wherein the ##STR6## radical is derived substantially from oleic acid, linoleic acid or mixtures of these. 
     
     
       16. In a method of inhibiting metal corrosion in hydrocarbonaceous liquid processing equipment by the introduction of amide-based corrosion inhibiting compositions into the equipment, the improvement comprising using a corrosion inhibiting composition containing as the principal component a compound having the structural formula: ##STR7## wherein x is an integer having a value of 0 to 12, R is a straight or branched chain alkylene group having 2 to 6 carbon atoms, R' R" and R'" are alkyl groups and the average sum of the carbon atoms contained in R' R" and R'" varies from 3 to 20 and R"" is an aliphatic hydrocarbon radical having 9 to 29 carbon atoms. 
     
     
       17. The method of claim 16 wherein R is the ethylene, propylene or butylene radical and x is an integer having a value of 0, 1 or 2. 
     
     
       18. The method of claims 16 or 17 wherein the average sum of the carbon atoms in R', R" and R'" is 3 to 18. 
     
     
       19. The method of claims 16 or 17 wherein R', R" and R'" are methyl radicals. 
     
     
       20. The method of claims 16 or 17 wherein the sum of the carbon atoms in R', R" and R'" is 8. 
     
     
       21. The method of claims 16 or 17 wherein the sum of the carbon atoms in R', R" and R'" is 18. 
     
     
       22. The method of claim 18 wherein R"" is an aliphatic hydrocarbon radical having 11 to 19 carbon atoms. 
     
     
       23. The method of claim 22 wherein R"" is an ethylenically unsaturated aliphatic hydrocarbon radical having 13 to 17 carbon atoms. 
     
     
       24. The method of claim 23 wherein the ##STR8## radical is derived substantially from oleic acid, linoleic acid and mixtures of these. 
     
     
       25. A process for preparing a corrosion inhibitor composition comprising reacting, at a temperature of about 50° to 250° C., (a) a polyamine having the structural formula   NH.sub.2 (NHR).sub.x --NH.sub.2        wherein R is a straight or branched chain alkylene group having 2 to 6 carbon atoms and x is an integer having a value of 0 to 12,   (b) a carboxylic acid having the structural formula ##STR9##  wherein R', R" and R'" are alkyl groups and the average total sum of the carbon atoms in R', R" and R'" is 3 to 20, and   (c) an aliphatic fatty acid having 10 to 30 carbon atoms.   
     
     
       26. The process of claim 25 wherein R is ethylene, propylene or butylene; x is 0, 1 or 2; the average total sum of carbon atoms in R', R" and R'" is 3 to 18; and said aliphatic fatty acid has 12 to 20 carbon atoms. 
     
     
       27. The process of claim 26 wherein the aliphatic fatty acid is ethylenically unsaturated and contains 14 to 18 carbon atoms. 
     
     
       28. The process of claim 27 wherein the aliphatic fatty acid is tall oil fatty acid.

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